Thanks for the feedback!
For the game balance, we should've invest more time in playtest and with different player, but i'm surprised you said that final boss was easier than the first one, because we only beat the last boss with spamming kunai(yeah it's a feature that you can exploit because it looks cool) in the second phase. The first one though, the key is to beat her fast enough before the bats are spawning like i said in other comment.
As for the graphic as you can see in the credits, the assets except Sakuro are created by many different creators, we tried to match the resolutions but it's a bit difficult because we need the assets to match the story too. But we've already takes notes and maybe in the next game the assets will be fully created by us.
Sorry for giving you a hard time and thanks for playing!